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Not sure of what OS you utilize, but Twitch recently released an app called Studio for Windows/OS X that allows you to very easily stream your desktop to their service.

Linux

Twitch is a lot more "discoverable" in that you can easily search for folks who are coding _right now_. I get lots of new viewers this way.

For YT, viewers would have to already know who they're looking for and so they're not likely to "stumble" across your stream.

Probably stream to both simultaneously until you figure out which one works better for you.

If you get Twitch affiliate or partner I believe you can stream on both YouTube and Twitch still just not simultaneously, at least that is what I have read. Not sure many big streamers have tried so not sure on the details.